In my opinion it is tears.
The photoreceptors would be your eyes, chemoreceptors skin, olfactory for nose and mechanoreceptors for obviously tongue hope this helps.
Viruses go around in the air and bacteria you have to touch
A because heat is a form of energy and the coffee is heating up the ice cube and it is not D because it is not releasing any byproducts when the ice cube is melted
Granite,chalk,slate, that si the only three i can think of at the moment
